hydraulic unit is with special wear resistant seals, which ensures 100% Leak Proof system. Lifting is done by up Down of handle as well as by a foot operated lever which is a unique feature of the stackers. this Hand Stacker lifts loads with manual hydraulic jack. The hydraulic unit is equipped with foot pedal to control fork lowering rate and ensure the hydraulic action accurate and reliable. the Lifting Forks are very easily adjustable to decrease or increase the width as required for pallets available with user.